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Duramax Diesel Performance Shop What's it take to make big power? Tips on Duramax diesel performance products, improving fuel economy, power upgrades, exhaust systems, and programming. From a little to a lot, find out what it takes. Post a question or offer your advice.

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Old 09-30-2020, 09:08 AM
SoTxPollock SoTxPollock is offline
Join Date: Dec 2004
Location: Texas
Posts: 683
Default 2020 Exhaust System

New 2020 GMC Truck purchased and while checking out the massive exhaust I noticed the extension on the end of the pipe giving the impression of a much larger exhaust. To my surprise the end of the pipe necks down to a 2 3/4" opening. That has me worried, on my old truck I had an exhaust temperature gauge so I could monitor the heat on a long pull. The new truck has no exhaust temperature readout anywhere I can find. It's the LP5 Duramax rated pretty high in torque and hp. Is 2 3/4" enough opening to get all the exhaust gases out without overheating the turbo? Can the opening be increased without setting any codes?
02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.
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Old 09-30-2020, 10:42 AM
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DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 12,773

A larger exit may be beneficial in some ways, but would certainly compromise the designed DPF regeneration process. The tailpipe is designed to cool the exiting gases to some measured degree so we don't set pedestrians on fire (hard-learned Ford lesson). Any modification or aftermarket solution must take this into consideration, as well.

As far as the size vs. power vs. heat goes, they aren't blowing up while making ridiculous gobs of power, so it may be a solution in search of a problem.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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